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chloasma

chlo·as·ma [ klō ázmə ] (plural chlo·as·ma·ta [ klō ázmətə ])


noun 
Definition:
 
brown patches on face: dark coloration on the skin of the face caused by hormonal changes related to pregnancy, liver disease, or the use of birth control pills. It is made worse by sunlight.

[Mid-19th century. < Greek khloazein "become green"]
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